Source: The Wrestling Observer Newsletter
Sin Cara has not been active in the ring at WWE live events the last two weekends due to suffering a concussion. According to sources, Sin Cara is believed to have suffered a concussion during his match with Jack Swagger on the 3/11 RAW as we noted earlier here on the website.
We're told Cara was later evaluated the following Monday on 3/18 and underwent Impact testing. He hasn't been active in the ring ever since.